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authorJarkko Sakkinen <jarkko.sakkinen@linux.intel.com>2016-04-19 12:54:18 +0300
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2016-10-07 15:21:27 +0200
commit8e20d9300ac8d29bd5ce8f9e6f635af2c696bab8 (patch)
treedbff8d9ca984663ac5cd46416fb0d47d13dd2d03
parent5a58005763c3e66468814706eeb79999525a6cf5 (diff)
downloadlwn-8e20d9300ac8d29bd5ce8f9e6f635af2c696bab8.tar.gz
lwn-8e20d9300ac8d29bd5ce8f9e6f635af2c696bab8.zip
tpm_crb: fix mapping of the buffers
commit 422eac3f7deae34dbaffd08e03e27f37a5394a56 upstream. On my Lenovo x250 the following situation occurs: [18697.813871] tpm_crb MSFT0101:00: can't request region for resource [mem 0xacdff080-0xacdfffff] The mapping of the control area overlaps the mapping of the command buffer. The control area is mapped over page, which is not right. It should mapped over sizeof(struct crb_control_area). Fixing this issue unmasks another issue. Command and response buffers can overlap and they do interleave on this machine. According to the PTP specification the overlapping means that they are mapped to the same buffer. The commit has been also on a Haswell NUC where things worked before applying this fix so that the both code paths for response buffer initialization are tested. Cc: stable@vger.kernel.org Fixes: 1bd047be37d9 ("tpm_crb: Use devm_ioremap_resource") Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com> Reviewed-by: Jason Gunthorpe <jgunthorpe@obsidianresearch.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
-rw-r--r--drivers/char/tpm/tpm_crb.c39
1 files changed, 28 insertions, 11 deletions
diff --git a/drivers/char/tpm/tpm_crb.c b/drivers/char/tpm/tpm_crb.c
index fd6a606b5308..0f7ec0deed6c 100644
--- a/drivers/char/tpm/tpm_crb.c
+++ b/drivers/char/tpm/tpm_crb.c
@@ -259,7 +259,10 @@ static int crb_map_io(struct acpi_device *device, struct crb_priv *priv,
struct list_head resources;
struct resource io_res;
struct device *dev = &device->dev;
- u64 pa;
+ u64 cmd_pa;
+ u32 cmd_size;
+ u64 rsp_pa;
+ u32 rsp_size;
int ret;
INIT_LIST_HEAD(&resources);
@@ -280,22 +283,36 @@ static int crb_map_io(struct acpi_device *device, struct crb_priv *priv,
return PTR_ERR(priv->iobase);
priv->cca = crb_map_res(dev, priv, &io_res, buf->control_address,
- 0x1000);
+ sizeof(struct crb_control_area));
if (IS_ERR(priv->cca))
return PTR_ERR(priv->cca);
- pa = ((u64) ioread32(&priv->cca->cmd_pa_high) << 32) |
- (u64) ioread32(&priv->cca->cmd_pa_low);
- priv->cmd = crb_map_res(dev, priv, &io_res, pa,
- ioread32(&priv->cca->cmd_size));
+ cmd_pa = ((u64) ioread32(&priv->cca->cmd_pa_high) << 32) |
+ (u64) ioread32(&priv->cca->cmd_pa_low);
+ cmd_size = ioread32(&priv->cca->cmd_size);
+ priv->cmd = crb_map_res(dev, priv, &io_res, cmd_pa, cmd_size);
if (IS_ERR(priv->cmd))
return PTR_ERR(priv->cmd);
- memcpy_fromio(&pa, &priv->cca->rsp_pa, 8);
- pa = le64_to_cpu(pa);
- priv->rsp = crb_map_res(dev, priv, &io_res, pa,
- ioread32(&priv->cca->rsp_size));
- return PTR_ERR_OR_ZERO(priv->rsp);
+ memcpy_fromio(&rsp_pa, &priv->cca->rsp_pa, 8);
+ rsp_pa = le64_to_cpu(rsp_pa);
+ rsp_size = ioread32(&priv->cca->rsp_size);
+
+ if (cmd_pa != rsp_pa) {
+ priv->rsp = crb_map_res(dev, priv, &io_res, rsp_pa, rsp_size);
+ return PTR_ERR_OR_ZERO(priv->rsp);
+ }
+
+ /* According to the PTP specification, overlapping command and response
+ * buffer sizes must be identical.
+ */
+ if (cmd_size != rsp_size) {
+ dev_err(dev, FW_BUG "overlapping command and response buffer sizes are not identical");
+ return -EINVAL;
+ }
+
+ priv->rsp = priv->cmd;
+ return 0;
}
static int crb_acpi_add(struct acpi_device *device)